Filter



March 26, 1935. v. "c,l NoRQulsT FILTER Filed' Feb. 5,1 1934 ATT NEY .Patented Maf.' 2s. Y

A UNITED STATES PATE.NT'{oFFIci;l

victor c. Norquist, Kansas ciy.1\r0.,fmioi to Butler Manufacturing Company, Kansas Oity. Mo., a corporation of Anuman February s, 1934'. sei-m No. 709,601 a claims. (cl. 21o-lazy` My ,invention relates to lters and more p ticularly to a lter having-incorporated therewith means for cleaning the ltering surfaces of theltering elements thereof.

In filters of the typ which comprise a casing in which hollow ilter members are placed in which the liquid ows into the casing through the ltering mediums into the interior thereof, and out of the iilter, the ltering surfaces be. come clogged and covered with matter lter'ed out. Thisnecessitates a cleaning and is, in the case of multi-nitering element-ltere, a diilcult and `time-consuming task.

'One object of my invention is to provide a simple and expeditious means -for cleaning the filtering surfaces of filters of` the `character de- Another .object of my invention is .to provide a cleaning means incorporated in a. -iilten which will not change the operation of the iilter,` and which will eliminate the necessity of opening 4the same for cleaning of the -iltering Further and other objects of invention will appear from the following description.

part of the instant-invention and is to be read in.- conjunction therewith, and in which likev ref erence numeralsare used to indicate like parts in the various views; i

3U Figure 1 is a side elevation partly in section of a. lilter embodying onemode of carrying out my invention. i

Figure 2 is a sectionalview taken on a line I2-2ofFigure`1. f Figure 3 is a sectional view taken on a line- 3-3 or Figure' 1. j

Figure 4 is ai'fragmentary sectional view showing details'of construction.

Figure is a fragmentary view showing a detail of the method. of seeming the scraper members to the mounting means. v

Figure 6.is a detail sectional view o n a. large -scale showing a section through the screen and a scraper member. l In general, my invention contemplates the provision of a'. mounting means carrying a pluraJity of scraper members lcontacting the lter screen surfaces. The mounting means vis arranged to-bereciprocated, carrying the scrapers over the. screen surfaoesin both directions of movement.

More-particularly referriugnow` to the drawing, a. lter casing 1 into .which .the liquid to be iiltered enters through inlet 2, houses a, plurality of hollow-filter leaves formedby screen sur-1 In the accompanying drawing which :torms'A faces 4 and 5. The interior of the meer leaves 3 communicates through nipples 6 with a manifold 'I through which the nitrate-is withdrawn. Within the fllter',-'I provide a pair of g'uide members 8 and 9. A frame member 10, substantially con-' -5 farming with th intermiperiphery of the n1- ter, carries guide members 11 and 12', 'adapted t0 coact with and ride on the guide rails 8 and 9. Y

The frame 10 carries a plurality of lugs -1 '4sym metrically spaced on opposite sides thereof as 10 can.readily be seen by reference to Figure 2.

Bars 15 have secured thereto transversely ex' tending blades 16, :which maybe-'made out of resmmt materiale: any sintablecharacter and Csecured to the `bars in any suitable manner as 15 for example by brazin'g, nuts, bolts, or the-like.

- '1'he. bars 15 are supported in pairs on opposite lsides of a pair of lugs 14; by means of cotter pins 17.' It is to be understood, of course, that any suitable means maybe used for attaching the 20 bars 15 to the lugs. The bars are provided with. a pair of holes 18 through which pins 19 are v positioned. One end of pin 19 is formed withk a head 20 adapted to bear against the surface c: one of the bars. Aspring 21 is adapted@ 25 urge the bars together.` The spring is secured in piace by means of a. washer 22and cotter pin 23. It is to be understood,` of course, that .any

suitable similar construction may be used. The result ofthe assembly is that the scraperblades larepressedagainstthescreensurfacesiand duetotheactionvofthespringszl. Itwillbe readily -understoodfthat this tension may be varied at will'by the use of springs of various degrees ofresiliency and length-or by means of 35 adjusting the pressure of a spring by a plurality of cotter pin holes orbyusng anut as the security means for the washer 22. 'This will be obvious from the nature'of the construction.

une guide members 11 and-12, which-are secured 40 Vto the frame 10, are provided with means for securing exible actuary meansisuch as a sprocket chain 24 thereto, ascan readily be appreciated l by reference to Figure" 4.1 The sprocket chain passes oversprocket wheels v25 and 26.' Sprocket 45.

wheels 26 are secured to shaft 27 by means of pins 28er in any othersuitablemanner. The' shaft2'1 extendsthroughthecasingwalll and is provided with a stuing box' 29. The protruding end of theshaft 27 carries. anoperating han- 50 die 30.

'In'operatiom after themter has been in use for some time and it is de'siredtoclean the-lteringsuri'aces thereof. the handle-30 is rotated.

'Iiiisrotates the shaft 27, and sprocketwlieels 26, Iii

v and drives the sprocket chains 24 which, it was pointed out above, are secured to the ends of ment, filter aid, and the llike, from the surfacesA of the screens. 'Aty the bottom of the reciproeating motion, that is, when guide members 11 and 12 contact sprocket wheels 25, the scraper blades will have. reached the lower limit of the screen surfaces 4 and 5. The handle 30 is then rotated in the opposite direction until the guide members 11 and12 contact the sprocket wheels 26, at which position the upper limit of movement is reached. During the reciprocating movement, the scraper blades will have traversed up and down both screen surfaces 0f each 0f the respective filter leaves simultaneously. The area of the scraper blades is small, so that very little filtering area is lost by the baliling action thereof. It will be noted that the scraper blades 16'have only their edges touching the l tering screens and are spaced therefrom intermediate the edges so that the filtering area is not obscured. It will be understood. that suitable f stops may be provided' in the guideways 8 and 9 to denne the limits 0f movement of the frame.

It will be seen that I haveaccomplished the objects of my invention. I'have provided'a simple and expedient cleaning means-'incorporated in a filter for cleaning the filteringwsurfaces without thenecessity of removing the filteringY screens or opening the filter. The sediment scraped from the filtering leaves precipitates to the lcwer portion of the lter and may be removed in a number of differentv manners.

It will be understood that certain features and sub-combinations are of utility and may be employed without reference to other featuresfand sub-combinations.I This is contemplated by and vis within the scope of my claims.

It is further obvious that various changes may be made in details within the scope of my claims without de' parting from the spirit of my invention. It is, therefore, to be understood that my invention is not to be limited to the specific details shown and described.

' Having thus described my invention, what I claim is:

1. In a filter having a lter casing, a plurality of filter members positioned within said casing` in spaced relation to each other, means for supplying liquid to be ltered into said casing and vmeans for withdrawing nitrate from said filter members; an annular frame surrounding said filter members, a plurality of pairs of scraper .members loosely and removably carried by said frame and disposed to contact opposite surfaces of respective iilter members, resilient means for urging said scraper vmembers toward each other into contact with the filter member surfaces and means for reciprocating said frame. v2. In a lter having a filter casing, aplurali of lter members positioned within said casing in spaced relation to ,each other, means for supplying liquid t0 be ltered into said casing and means for withdrawing ltrate from said lter members; an annular frame surrounding said filter members. a plurality of lugs carried by said frame, a plurality of pairs of scraper members movably carried by` said lugs and disposed to contact opposite surfaces of vrespective lter members, and resilient', means for urging said scraper members into contact vwith the filter member surfaces, and means for reciprocating said frame.

3. Ina lter havingv a filter casing, aa plurality of filter members positioned within said lcasing in spaced relation to each other, means for supplying liquid to be filtered into said casing and means for withdrawing filtrate from said lter members; an annular frame surrounding said lter members, a plurality of lugs carried by said frame, a plurality of pairs o'f scraper members movably carriedby said lugs and disposed to contact opposite surfaces of respective filter members, resilient means for urging s aid scraper members into contact with the filter member surfaces, a shaft extending into said casing, a pair ofpinions keyed to said shaft, a pair 0f chains disposed within said casing for actuation` by said `pinions, means for seeming said chains to said frame, and means for rotating said shaft from without said casing, whereby to reciprocate said frame.

VICTOR CLNORQUIST. 

